though. just over 50% of the vote. >>> and in this countrythef.a.a. hasordered more than a thousand, mostly late model boeing 737s to be examined to see if a part of the planes' tails need to be replaced. specifically it's a pin that holds the horizontal stabilizer which the pilots use to control the pitch of the aircraft. the potential defect has not caused any accidents. f.a.a. says there is no immediate threat. if that were the case they say the planes would all be grounded and nothing close to that is happening. >>> we're back with more of our coverage of the attack today in boston right after this. >>> we are back and back up to boston we go. nbc's katy tur was able to make her way up there after first word of this. it was striking to hear the governor of massachusetts tell people to stay in their homes, stay off the streets and avoid crowds. i imagine the center of the city still feels so eerie. >> so eerie, brian. everything that was dropped along the race route now is being considered suspicious. so they didn't want anybody around potentially dropping anything else or potent